<html>
  <head>
    <style>
      body {
        background-color: skyblue;
        margin: 2px;
      }
    </style>
  </head>
  <body>
    <div>
      <span>iframe origin:</span>
      <span id="iframe-origin"></span>
    </div>
    <div>
      <span>cookie value:</span>
      <span id="test-cookie"></span>
    </div>
    <script>
      document.getElementById('iframe-origin').textContent = window.origin;
      document.cookie = 'foo=88';
      document.getElementById('test-cookie').textContent = document.cookie;
    </script>
  </body>
</html>
